SubText is an open-source file format that keeps sentence-level notes with prose
HamelHusain · x · 2026-07-24
A new open-source format called Subtext / SubText is being introduced as a way to manage context while writing.
The idea is to attach notes to individual sentences so that the notes stay with the document itself. That means a person — or an LLM — can later inspect what motivates or supports a specific line of prose.
According to the quoted announcement, SubText sits at the intersection of:
- philosophy
- a file format
- LM tooling
It was built to solve a practical writing problem, and the pitch is that it makes prose more traceable for both humans and models.
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